Commutator-cylinder



R. E. HELLMUND.

COMMUTATOR CYLINDER.

APPLICATION FILED SEPT. 10, 1917.

1,358,736. Patented Nov. 16,1920,

RUDOLF E. HELLMUND, OF SWISSVALE, PENNSYLVANIA, ASSIGNOR TO WESTING-HOUSE ELECTRIC & MANUFACTURING COMPANY, A

SYLVANIA.

CORPORATION OF PENN-.

COMMUTATOR-CYLINDER.

Specification of Letters Patent. P t t N0 1 1920 Application filedSeptember 10, 1917. Serial No. 190,504.

T 0 all whom it may concern:

Be it known that I, 'RUnoLF E. HELLMUND, a citizen of the German Empire,and a resident of Swissvale, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement inCommutator-Cylinders, of which the following is a specification.

My invention relates to commutator cylinders for dynamo electricmachines, and it has special relation to means for connecting armatureconductors to the conducting bars of such cylinders.

The object of my invention is to provide a novel form of commutatorcylinder in which a larger number of conducting bars may be embodied ina commutator cylinder of a given diameter than has been possible withprevious constructions.

The apparatus disclosed in this application is an improvement upon thatdescribed in the co-pending application of Vero M. Allen, Serial No.199,627, filed Nov. 1, 1917, assigned to the W. E. & Mfg. Co.

As heretofore constructed, a commutator conducting bar comprises alongitudinal portion, which is so placed as to extend parallel to themachine axls, and a radially extending portion at right angles thereto,usually known as the neck, to which the armature conductors areelectrically connected. The number of bars in a commutator cylinder of agiven diameter is not limited by the widths of the bars, which may bemade relatively narrow, but by the combined widths of the necks, thearmature leads at the points where they are connected and the insulationbetween adjacent necks. This limitation has given rise to somedifficulty in designing commutator cylinders havin a large number ofbars, without unduly 1ncreasing the diameter, for instance, incommutator cylinders for use in high-voltage direct-current machines.

In the accompanying drawing, Figure 1 is a view, partially in elevationand partially in section, of a commutator constructed in accordance withmy invention. Fi 2 is a sectional View of the commutator s own in Fig.1, taken along the line 11-11 thereof. Fig. 3 is a sectional view of acommutator embodying a modification of my invention, and F 1g. 4 is asectional view of the commutator shown in Fig. 3, taken along the lineIV-IV thereof.

Referring more particularly to Figs. 1 and 2, the commutator cylindercomprises two sets of conducting bars 1 and 2 which arecircumferentially arranged upon a suitable supporting member. The bars 1are provided with necks 3 to which armature leads 4 are electricallyconnected. The necks 3 of the bars 1 are longitudinal projections fromthe bars and are a relatively short distance from the axis of the shaftof the machine. Conducting bars 2 of the other set are provided withnecks 5 to which armature leads 6 are electrically connected. The necks5 of the bars 2 project radially from the bars and. are a relativelygreater distance from the axis of the shaft than the necks 3. The bars 1and 2 are alternately arranged around the commutator cylinder so thatthe armature leads of various bars will not interfere with each other onaccount of the necks of the alternate bars being at different distancesfrom the commutator axis. The necks of the conducting bars 1 and 2 maybe welded into slots in the bars.

In Figs. 3 and 4 I show a commutator comprising alternately arrangedsets of con ducting bars 7 and 8, the bars 7 being provided with necks 9and the bars 8 being provided. with necks 10. The necks 9 of the bars 7are situated at a greater distance from the axis of the shaft than thenecks 10 of the bars 8.

The bars 7 and 8 are insulated from each other by strips of insulatingmaterial 11 and each of the bars 7 is provlded with a narrow portion 12which serves as a bracing member for the neck 10. In like manner, eachof the bars 8 is provided with an upwardly extending narrow portion 13which serves as a bracing member for the necks 9 of the bars 7.

By assembling a commutator cylinder in the manner described, so that thenecks of the alternate bars are at different distances from the axis ofthe shaft of the machine, a larger number of bars may be used than wouldotherwise be possible, as previously pointed out.

While I have shown my invention in a plurality of forms, it will beobvious to those skilled in the art that it is not so limited but issusceptible of various minor changes and modifications without departingfrom the spirit thereof, and I desire, therefore, that only suchlimitations shall be placed from the cylinder axis.

8. In a dynamo electric machine, a comutator cylinder comprising twosets of alternately (IllSPOSQCl bars, the necks of one 7 set of proecting longitudinally and those of the other setprojecting radially.

l. in a dynamo-electric machine, a com- 'niutator cylinder comprisingtwo sets of alternately disposed bars provided With necks, the neclrs ofthe two sets being;- Vdisposed at different radial and also differentlongitudinal distances from said cylinder.

In testimony whereof, I have hereunto subscribed my name this 20th dayof August 191 RUDOLF n. HELLMUN D.

